Crossrail has announced that the project has reached the halfway stage with the central London station building programme and almost 5km of platform and station tunnels are now complete.

The box structures for Paddington, Canary Wharf and Woolwich have been created using diaphragm walls and secant piling techniques to enable top down construction.

The underground caverns for Bond Street, Tottenham Court Road, Farringdon, Liverpool Street, and Whitechapel stations are being created using sprayed concrete lining methods.

Custom House station is the only above ground station and the building is being constructed using off site fabrication with sections of the station being built in the East Midlands and transported more than 209km to east London and assembled on site.

New details of issues encountered by Crossrail when tunnelling under central London have emerged. They include an incident which sent bricks from a Victorian well “dramatically flying through the excavation”.

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